Injector



J., J. C.AND R. D. NIETCALFE. INJECTDR.

APPLlcATloN FILED Nov. s. 1919.

1,342, 1 28. Patented June 1, 1920.

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JAMES METCALFE AND JAMES CROXON METCALFE, .0F MARBLE, AND RICHARD DAVID METCALFE, 0F ROMILEY, ENGLAND,

INJ'EcToR..

To all whom it may concern: A,

Be it known that we, JAMES METCALFE and JAMES CRoxoN METCALFE, residents of Marple, and RICHARD DAVID METOALFE, resident., of Romiley, both in the county of Chester, England, subjects of the King of Great Britain and ireland, have invented certain new and useful Improvements in Injectors, of which the following is a speciication. l

This invention relates to injectors worked by exhaust steam or steam at about atmospheric pressure.

`With` the v ordinary construction of exhaust steam injector employing one exhaust steam nozzle with an annular water inlet passage therearound, it is possible to deliver against boiler pressures of from 7 5 to 90 lbs. per square inch only, dependent upon the temperature of the feed water being dealt with.

In the specification of our Patent No.

Y 944,455, we described an improved construction of exhaust steam injector in which, by

dividing up the quantity of exhaust steam admitted into two or more portions, one or more of which impinge upon the feed water after it has been met by the first exhaust steam jet, we were able to deliver against a pressure of about 120 lbs. per square inch, dependent upon the temperature of thefeed water.

By further investigation and experiment- 'cone or preliminary mixing nozzle (which at its inlet end receives water and the main exhaust steam jet and around its delivery end has a second jet of exhaust steam) and the combining nozzle, we are enabled to deliver against pressures of about 1'50 to 180 lbs. pre'r square inch dependent on the temperature of the feed water.

Our invention consists therefore in the arrangement in an exhaust injector comprising a main exhaust steam nozzle, a water cone or preliminary mixing nozzle, into the inlet end of which water issues with the exhaust steam from the main nozzle, and around the delivery end of which a supplementary exhaust steam jet issues, and a combining nozzle, of a further preliminary mixing nozzle between the water cone and the combiningnozzle, the gap between said further nozzle .and thecombining nozzle specification of Letters Patent.

vhaust injector constructed in one convenient Patented June i, 192e.

Application iled November 6, 1919. Serial No. 336,173.

communicatingV with a closed chamber or compartment in which a high degree of vacuum is created and maintained by the jet traveling into the combining nozzle.

We do not limit ourselves to any par.- 'ticular arrangement of the combining nozzle, the latter having gaps or slots, iiaps or sliding nozzles for giving the necessary overflow at starting.

The increased delivery pressure obtainable with our improved construction enables us to reduce very considerably the quantity of live steam necessary for delivering against high boiler pressures.

[Referring to the accompanying sheet of explanatory drawings Figure l is a sectional elevation and Fig. 2 a sectional plan view of part of the injector shown in` Fig. 1, ,illustrating an exform in accordance with our invention.

, The main exhaust steam inlet nozzle is shown at a, the water cone at b, the supplementary steam .inlet at c, the combining nozzle at d, and the delivery nozzle at e. In the illustrated example, the combining nozzle is fitted with a flap f and the removable portion g, but we do not limit ourselves to such construction. Between the water cone b and the combining nozzle d, we provide, according to this invention, a nozzle h, and we arrange a closed vacuum chamber z' around said nozzle and communicating with the gap j between the nozzles k and d. The jet passing through the nozzles produces a high degree of vacuum in the chamber as before referred to.

The live steam nozzle k is provided for enabling the injector to worlr against higher boiler pressures than the -exhaust steam alone can deliver against. The hanging valve fm. cuts off the ordinary exhaust steam inlet when exhaust steam is not available. The steam nozzle ais adjustable with relation to the nozzle b for controlling 100 from the main nozzle, and around the deliv- 11o ery end of which a supplementary exhaust andmaintained by thejlet traveling into the I steam jet issues, a, combining nozzle, aA decombining nozzle, as set forth.l v 10 livery nozzle, e `further preliminary mixing In testimony whereof We have signed our nozzle between the water cone Aand the comnames to this specification. bining nozzle, and a compartment ,com-V municatin with the. gap between said fm.l `JAMES METCALFE. ther lnoz'z e `and the combining nozzle in JAMES CROXON METCALFE. which a' high degree of vacuum is created. RICHARD DAVID METCALFE. 

